8.2 arpa/inet.h

POSIX specification:
http://www.opengroup.org/onlinepubs/9699919799/basedefs/arpa_inet.h.html

Gnulib module: arpa_inet

Portability problems fixed by Gnulib:

• This header file is missing on some platforms: mingw, MSVC 9, BeOS.

Portability problems not fixed by Gnulib: